基于液晶的太赫兹反射式波束扫描天线

Terahertz reflective beam scanning antenna based on liquid crystal

摘要:

提出了一种基于液晶的太赫兹电控反射式移相器及其构成的波束扫描阵列天线。通过采用液晶调控的开槽结构移相器，解决了液晶调控过程中谐振层覆盖面不足造成的液晶取向不均、边缘效应和饱和电压增大等问题。设计了工作在380 GHz三开槽的移相器，对谐振频点的表面电流分布和谐振频点进行了仿真分析。数值计算结果表明当液晶相对介电常数在2.47~3.26范围内变化，377~392 GHz频率范围内移相器能够实现360°的相移。采用三开槽结构反射相移单元，设计了工作于380 GHz的电控波束扫描阵列天线，实现了30°范围内的一维波束扫描，主瓣增益大于20 dBi。

Abstract:

A terahertz electrically controlled reflective phase shifter based on liquid crystal is proposed as well as its beam scanning array antenna. By using the slotted structure, the problems of uneven orientation, edge effect and increased saturation voltage due to the insufficient coverage of resonant layer in the process of liquid crystal regulation can be solved. A phase shifter with three slots at 380 GHz is designed, and the surface current distribution and resonance frequency points are simulated. The numerical results show that the phase shifter can achieve 360°phase shift in 377-392 GHz when the relative dielectric constant of liquid crystal changes in 2.47-3.26. An electronically controlled beam scanning array antenna operating at 380 GHz is designed by using a reflective phase-shifting unit with three slots. One dimensional beam scanning within 30°is realized, and the main lobe gain is greater than 20 dBi.